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Check out NestedLoops in Algorithm::Loops. In this case,

use Algorithm::Loops qw( NestedLoops ); use List::Util qw( reduce sum ); sub mul { return reduce { $a * $b } @_; } NestedLoops( [ map { [ 0..$n_ra->[$_] ] } 0..$#$n_ra ], sub { $prob_ra[sum @_] += mul map { $f_raa->[$_]->[$_[$_]] } 0..$#_; } );

I suspect that
$n_ra->[X]
is equal to
$#{$f_raa->[X]}
in which case
map { [ 0..$n_ra->[$_] ] } 0..$#$n_ra
can be replaced with
map { [ 0..$#$_ ] } @$f_raa


In reply to Re^2: Small examples of string eval by ikegami
in thread Small examples of string eval by spurperl

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